Materials Literature
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Abstract Epoxide and aldehyde end‐functionalized poly(ethylene glycol)s (PEGs) ( M w = 400, 1000, 3400, 5000, and 20,000) were grafted to poly(ethylene terephthalate) (PET) film substrates that contained amine or alcohol groups. PET‐PAH and PET‐PEI were prepared by reacting poly(allylamine) (PAH) and polyethylenimine…
The microchemistry and magnetism of conventional and high-temperature Sm–Co permanent magnets are investigated by first-principles calculations. Particular emphasis is on the site preference for the substitution of Cu, Ti, and Zr in SmCo5 and Sm2Co17 compounds. Cu substitution is more favorable in the 1:5 phase, in ag…
We present the time resolved experimental characterization of the biaxial switching between two topologically distinct textures of a nematic liquid crystal cell submitted to a strong electric field. This fast electro-optical effect is governed by the electric induced order reconstruction in the nematic bulk, which is…
Applying a combinatorial methodology, (1−x)Na0.5Bi0.5TiO3−xBaTiO3 (NBT-BT) thin-film chips were fabricated on (001)-LaAlO3 substrates by pulsed laser deposition with a few quaternary masks. A series of NBT-BT library with the composition of BT ranged from 0 to 44% was obtained with uniform composition and well crystal…
We have studied the optical property and electronic structure of an inorganic-organic quasi-one-dimensional crystal, methylviologen lead iodide. Two absorption bands were observed in the near ultraviolet and visible regions. The one is an absorption band at $3.1\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ with a large osci…
Schottky barrier contacts have been formed by electron beam evaporation of Pd on the (0001¯)-face of hydrothermally grown n-type single-crystalline ZnO. The contacts can be operated under reverse bias voltages up to −5V and in the temperature range between 130 and 350K. A barrier height of 0.83eV is deducted at room t…
Nanocrystalline lead lanthanum titanate (Pb0.72La0.28)Ti0.93O3 (PLT) thin films with grain size of 40–60 nm were grown on Pt/Ti/SiO2/Si(100) substrates by using a sol–gel method with rapid thermal annealing process. The spontaneous electrical polarization, remnant polarization and the coercive field are 11.9 μC/cm2, 0…
이hex-3-ene deriva tives, Intellegent material Phtochromism is defined as the reversible conversion induced by light of a substance A (photochrome) into product B differing in absorption spectrum (color) and internal energy, dielectric constant and other physico chemical parameters.Photochromic materials are used widel…
Carbon nanotubes (CNTs) have been one of the inten sively-studied topics in the fields of nanoscience and nanotechnology due to their unique electronic, mechanical, and chemical properties.1,2Shortened single-walled carbon nanotubes (s-SWCNTs) with length of 100-300 nm are promising nanomaterials in the applications o…
In this paper, the UV Raman spectra of a large number of saturated and alkyl-substituted monocyclic, bicyclic and polycyclic aromatic hydrocarbons are obtained at 220 and 233 nm excitation wavelengths. Also included are nitrogen- and sulphur-containing hydrocarbons. The spectra obtained are fluorescence free, even for…
We propose a novel formation method of arbitrary phase profiles of circular light by controlling azimuthal angles of liquid-crystal directors; its principle is described theoretically. A new liquid-crystal blazed grating is demonstrated by use of the proposed method. It is revealed that the first-order diffraction eff…
This work presents a comparative study of the morphology and structure-related properties of thermoplastic elastomer blends based on SEBS-PP-oil and dynamically vulcanized EPDM-PP-oil prepared under identical conditions. Compositions of each blend type with three different SEBS-PP and EPDM-PP ratios by weight were mad…
The atomic structure of [0001]-tilt grain boundaries in ZnO was investigated using high-resolution transmission electron microscopy (HRTEM) and atomistic calculations. HRTEM observation was conducted for [0001] fiber-textured ZnO thin films grown on quartz-glass substrates by the pulsed-laser deposition. The [0001]-ti…
Glass ceramics of composition 95SiO2-5SnO2 doped with 0.4mol% Eu3+ have been prepared by thermal treatment of sol-gel glasses. The segregated SnO2 nanocrystals present a mean size comparable to the bulk exciton Bohr radius (about 2.4nm), corresponding to a wide band-gap quantum-dot system in an insulator SiO2 glass. A…
Abstract The lowering of ignitability and flammability of polyethylene (PE) and the production of fire‐retarding materials has become an urgent problem because of the demand of fire safety. In our article, a new charring agent (CA), a derivative of triazines, was synthesized by charging 2‐amino‐4,6‐dichloro‐s‐triazine…
The domain structures of annealed (001)-oriented Pb(Mg1∕3Nb2∕3)O3-x%PbTiO3(PMN-x%PT) crystals for x=10, 20, 30, 35, and 40at.% have been investigated by polarized optical microscopy and scanning force microscopy in the piezoresponse mode. The results demonstrate the presence of a domain hierarchy on various length sca…
Effects of temperature and pressure on magnetic, elastic, structural, and thermal properties of ${\mathrm{T}\mathrm{b}}_{5}{\mathrm{S}\mathrm{i}}_{2}{\mathrm{G}\mathrm{e}}_{2}$ have been studied by means of macroscopic (thermal expansion and magnetization) and microscopic (neutron powder diffraction) techniques. We pr…
A general analytic expression for the Young’s modulus of a range of carbon nanofibers (CNFs) with single or multishell nanocone or cone stacked structures has been developed from continuum elastic theory. The Young’s modulus of a single-shell nanocone is found to be cos4θ of that of an equivalent single-wall carbon na…
Temperature effects on the energetics of the 90-degree partial dislocation in silicon and germanium are investigated, using non-equilibrium methods to estimate free energies, coupled with Monte Carlo simulations. Atomic interactions are described by Tersoff and EDIP interatomic potentials. Our results indicate that th…
Scalability and performance of current flash memories can be improved substantially by replacing the floating polycrystalline-silicon gate by a layer of Si dots. Here, we present both experimental and theoretical studies on ion beam synthesis of multi-dot layers consisting of Si nanocrystals (NCs) embedded in the gate…